Supporting concrete beam



R- SAHLB SUPPORTING CONC Feb. 1I," 19301v Filed Ag. 2

ERG' 1,746,559

RETE B EAM Mn? INVENTJR s wwf/fw;

1/5 ATTORNEYS Patented Feb. 11, 1930 NUnire!) `STATES PATENT orificeROLF SAI'ILBERG, OF NEW YORK, NY., ASSIGNOR THE AEROCRETE`GORPOllt-A'JIION 0F AMERICA, OF NEW YORK, N. Y., A CORPORATION OFDELAWARE SUPPORTING centenaria BEAM Application filed August 25, 1927.Serial No. 215,375.

This invention relates to the supporting of beams, particularly beamsused in c oncrete building construction, and the object of the inventionis the provision of an 1inproved method and improved means forsupporting beams upon girders.` The invention `is directed particularlyto the supporting of concrete beams upon steel girders.

In constructing i buildings in which the weight of thebuilding iscarried upon a structural steel skeleton or framework, and where-` inthe floors and `partitions are of lireproof material, such for example,as concrete, the differences inshape'of the steel members of thebuilding, and the concrete members of the building, as well as thephysical differences of these two sets of members, renders it diflicultto satisfactorily secure the'concrete members to the steel members.

In such building construction it is important that the concrete elementsor members shall be fastened to the steel members with a high degree ofsecurity so that vibration will not be `apt to loosen thefastening, andso they cannot become displaced. It is undesirable to merely rest thebeams or licor members directly on the tops of the steel girders becausethen the entire depth of the lgirder projects below the bottoms of thebeams or floor members, and occupies space in the room below. In largebuildings, par# ticularly in the lower floors, the depth of thesteel1girders is suficient to occupy an undesirably large amount of space inthis way. Another substantial consideration is the fact that it isnecessary to protect the steel girders against the danger of beingweakened by overheating in the event Of fire. i

These difficulties are to a large degree over comeA by my presentinvention, and the vention will be better understood by referring to theaccompanying drawings, together with the` following` description. Itwill be understood, however, that the drawings illustrate only oneembodiment of the` invention in illustrating the principles of theinvention. In these drawings?, Fig. `l vis a plan view of a singlegirder with a plurality of floor members thereon at one end;

F ig. 2 is a vertical section taken on line 2-2 of Fig. l, showing acompleted support or joint structure poured with cementitious material;

Fig. 3 is a vertical section taken on line 3-3 of Fig. l centrallythrough a pair of tins on the two mold formsor parts; and

Fig. l is a plan view of one of these mold parts.

It will be understood that the frame of the building consists of aplurality of primary supporting members orgirders which are of steel,and on these primary supporting members, secondary members, such asjoists, or beams, may be supported,the floorielements or members beingin turnsupported on these secondary members. 0n the other hand, thefloor elements or members may be supported directly upon the primarymembers, namely upon the steel girders. The secondary members mentionedabove may be made either of steel or of concrete. My invention may beemployed in securing concrete beams to the primary members, or insecuring concrete floor elementsto the secondary members, orin any placeWhere it is desired to secure a concrete load-support ing buildingelement to a steel beam, joist or girder. i i

Referring now to the accompanying drawings, I have illustrated theinvention in connection with the supporting of a plurality of floorelements lO on the left hand side of a primary member or girder ll, anda plurality of other floor elements 12 on thc right hand side of thisgirder. The girder 11 is of a construction such that it has ledges 13and lllon its left and right hand sides respectively, and inasmuch asthis girder is of I-beam section, these ledges are just above the bottomof the girder. lI make use of these ledges in the formation of myimproved oint structure, and particularly during the making of thisjoint structure.

In carrying out my invention, I rst con-y struct inold parts 15 which,as shown in Fig. l, are elongated bodies having walls, of appropriateshape to formV the walls of a consupported section as may be seen inFig. 2. ProjectingY inwardly from the vertical walls 16, atappropriately spaced points there are provided the fins 19, these finsbeing preferably formed integrally with both the walls 16 and 17 Theseiins constitute laterally extending formations or wide lugs on the walls16 forv the purpose of supporting the mold part 15 upon the girder 11,as will presently appear.

The mold parts 15 are made of appropriate fire-proof or dre-resistingmaterial which possesses relatively high compressive and shearingstrength, that is, a strength comparable to that of the cementitiousmaterial which is later to be poured into; the mold parts to completethe beamV or floor support. Concrete may advantageously be employed forthe material of the mold parts of forms 15, and these parts cast 1nappropriate molds in which are first positioned the longitudinalreinforcing bars 20 usually of steel, and also the metallic reinforcements 21. Concrete of any kind, that is, either ordinary denseconcrete, or light weight concrete, such as porous, expanded or aeratedconcrete may be used. Reinforcement 21 is provided for each of the finsor lugs 19 and may conveniently be made from a steel bar bent to theshape illustrated in Fig. 3 so that the upper portion 22 thereof extendsinto the upper part of each lug 19 above the ledge 14, and so that thelower part 23 extends into the lower portion of each fin 19 below thebottom of the I- beam, when such lower portion is provided.

In bending this reinforcement 21 it is also convenient to form a loopwhich extends outwardly into the wall 16 and to make the lower end 23 ofsuflicient length to extend downwardly into the wall 17. In this wayboth the upper and lower parts of the fins or lugs 19, are anchored tothe walls 16 and 17. N otches 24 are cut deeply into each of the lugs orfins 19 so as to form shoulders adapted to rest upon the` ledges 13 and14 of the girder 11 and support the lnold parts or forms 15 thereon, andit will be understood that the upper portion 22 of reinforcement 21 islocated above the notch 24, andthe lower portion 23 below this notch.

A sufficient quantity of the mold forms or parts 15 areprecast, usuallyunder factory conditions, where the materials and molding operations canbe carefully controlledso as to insure maximum strength, and these moldparts are suppliedto the building which is under construction.

In construct-ing my improved joint struc'- ture, a pair of mold parts 15are placed upon the girder 11, one on each side, as shown in Fig. 2,with the shoulders of the lugs 19 resting on the ledges 13 and 14 of thegirder. Then a clamp 25 of appropriate construction, and indicateddiagrammatically in Fig. 2, is placed upon the pair of mold parts so asto hold them in the position shown in this figure, with the innervertical surfaces 26 of the lugs or fins 19 in contact with the web ofthe girder 11. The vertical surfaces of the fins 19 are so formed tocorrespond to the surfaces of the web 11 that the exterior walls 16 areparallel, and so that the edges 27 of the lower wall 17 meet and form acomparatively tight joint running longitudinally beneath the center ofthe girder. Notches 24 are so positioned vertically in the lugs 19 thatthe upper edges 28 of the side walls 16' are below the top of the girder11. This distance below the top of the girder will depend upon thethickness of the floor elements 10. Preferably these dimensions arearranged so that the bottom of the floor elementslO are well below thetopV of the girderv 11, and the upper surfaces of the floor elements 10are above the top of the girder only far enough to permit afire-resisting coating of cementitious material to be placed on the topof the girder in order to protect it.

It will be understood that pairs of mold parts 15 are placed end to endas just described, throughout the length of the gir der 11.

A space 29 is provided throughout the length of the girder through whichcementitious material may pass to the spaces 30 between the lugs 19 oneach side of the girder 11. In order to expedite the introduction ofthis cementitious material, the corners of the floor elements 10 and 12are beveled, as indicated in Fig. 1, so as to provide passageways 31spaced along each side of the girder. Fig. 2 illustrates the completedsupport struc* ture after the introduction of the cementitious materialindicated by reference numeral 32. This material may consist of variouscement and water mixtures, included in which may also be appropriateaggregate material, such as sand, or crushed rock of a relatively fineparticle size. Various kinds of light weight or highly porous concrete,such as expanded or aerated concrete may also be used as thecementitious material 32, in which case the aggregates mentioned abovemight be used, but preferably a porous clay clinker should be used.

The cementitious material 32 passes around underneath the bottom of thegirder 11 and completely fills all parts of the spaces 30 between thelugs 19. The material also fills the space between the inner ends of thefloor elements 10 and 12 andthe space above the top ofthe girder so asto make a smooth continulli ous ioor across the top of the girder whendesired. The oor elements and 12 are supported upon the upper edges ofthe side walls 16 of the mold parts 15 after the mold parts areassembled upon the girder 11, and before the spaces 30 are filled withthe cementitious material 32. The inner ends of the floor ele ments 10and 12, howev'er, preferably project inwardly beyond the wall 16 so thatwhen the cementitious material 32 has set, the floor elements are thensupported partly by this material 32, and partly by the wall 16. The

` clamps 25 are removed after the cementitious his material 32 has set.In setting, the cementitious material 32 interloeks or unites to agreater or less degree with the walls 16 and 17 of the mold parts 15, asWell as with all surfaces of the fins or lugs 19. Hence the mold parts15 become an integral part of the supporting structure for the floorelements `10 and 12, and while they serve merely as temporary supportsduring the assembling and pouring of the joint structure, they alsoultimatelybecome a permanent part of thisistructure.

What I claim as my invention and desire to secure by Letters Patent ofthe United States 1s:

1. In a building structure, the combination of a primarysupportingmember having a ledge extending longitudinally thereof on each side, apair of preformed secondary members disposed at right angles to saidprimary member .and having their bottoms positioned below the top of theprimary supporting member and their ends in spaced relation thereto, apair of mold parts engaging the lower surfaces of said secondary membersand having lugs engaging the shoulders on said primary member, and alling of cementitious material in the spaces between said primary memberand said mold parts and the ends of said secondary members.

2. In a building structure, the combination of a primary supportingmember having a ledge extending longitudinally thereof on each side, anda transverse portion extending along the top thereof, a pair of moldparts disposed along each side of said primary member having lugsengaging the shoulders on said member, and a plurality of elongatedfloor elements disposed at right angles to said primary supportingmember, the lower surfaces thereof engaging the upper surfaces of saidmold parts, and having undercut ends projecting beneath the transverseportion of the primary supporting member, and the corners of said floorelements being beveled to provide a plurality of spaced apertures forthe introduction of cementitious material into the spaces between saidprimary member and said mold part and the ends of said Hoor elements.

3. In a building structure, the combination of a primary supportingmember having a ledge extending longitudinally thereof on each side,preformed secondary members disposed at right angles to said primarymember and having their bottoms positioned below the top of the primarymember and their ends in spaced relation thereto, a mold part engagingthe lower surfaces of said preformed secondary members and surroundingthe lower portion of the primary supporting member and having lugsengaging the shoulders on said primary supporting member, and a fillingof expanded concrete in the spaces between said primary member and saidmold part and between the ends of said secondary members.

4. As an article of manufacture, a device for securing beams to girdersin building construction comprising a mold part of concrete materialhaving vertical and horizontal walls formino a substantially L-shapedbody, spaced Iins projecting inwardly from the vertical wall of the moldpart and upwardly from the horizontal wall thereof, said fins beingprovided with aligned recesses forming shoulders for supporting the moldpart upon the girder and each of said fins having a continuous metallicreinforcement extending from t-he fin portion above its recess into thefin portion below said recess.

In testimony whereof I aiiix mv signature.

ROLF SAIILBERG.

